body {
  font-family: 'Comic Sans MS', cursive, sans-serif;
  background-color: #f8e9a1;
  text-align: center;
  margin: 0;
  padding: 20px;
}

h1 {
  color: #e74c3c;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.unit {
  background-color: #fff;
  border-radius: 10px;
  margin: 20px;
  padding: 15px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.unit h2 {
  color: #3498db;
}

.lesson-list {
  list-style-type: none;
  padding: 0;
}

.lesson-list li {
  background-color: #ecf0f1;
  border-radius: 5px;
  margin: 5px;
  padding: 10px;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.lesson-list li:hover {
  transform: scale(1.05);
}

audio {
  margin-top: 20px;
}

#buttonContainer {
  margin-top: 10px;
}

#buttonContainer button {
  background-color: #3498db;
  border: none;
  border-radius: 5px;
  color: white;
  padding: 10px 20px;
  margin: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#buttonContainer button:hover {
  background-color: #2980b9;
}